AUTHORS : Braa S S Naughton G K Triglia D Yonan C In vitro toxicity of various classes of test agents using the neutral red assay on a human three-dimensional physiologic skin model 1991 In Vitro Cell Dev Biol 1991 ;27a (3 Pt 1):239-44 | Marrow-Tech, Inc., La Jolla, California 92037.